ci: Split mainline pipeline and add support for GitHub releases (#2900)

* ci: Add mock build alternative for fast testing

* ci: Always cache build

* ci: Extract steps to download build stage artifacts

* ci: Add template to release to GitHub

* ci: Add template to release to Azure Universal Artifacts

* ci: Split mainline to two pipelines

.ci/yuzu-mainline-step2.yml

@@ -0,0 +1,28 @@
+trigger:
+- master
+
+stages:
+- stage: format
+  displayName: 'format'
+  jobs:
+  - job: format
+    displayName: 'clang'
+    pool:
+      vmImage: ubuntu-latest
+    steps:
+    - template: ./templates/format-check.yml
+- stage: build
+  dependsOn: format
+  displayName: 'build'
+  jobs:
+  - template: ./templates/build-standard.yml
+    parameters:
+      cache: 'true'
+- stage: release
+  displayName: 'Release'
+  dependsOn: build
+  jobs:
+  - job: github
+    displayName: 'GitHub Release'
+    steps:
+    - template: ./templates/release-github.yml